Adaptive writing method for high-density optical recording apparatus and circuit thereof
An adaptive writing method of a high-density optical recording apparatus and a circuit thereof. The circuit includes a discriminator for discriminating a magnitude of a present mark of input NRZI data and magnitudes of leading and/or trailing spaces of the input NRZI data, a generator for controlling the waveform of a write pulse in accordance with the magnitude of the present mark of the input NRZI data and the magnitudes of the leading and/or trailing spaces of the input NRZI data to generate an adaptive write pulse, and a driver for driving a light source by converting the adaptive write pulse into a current signal in accordance with driving power levels for respective channels of the adaptive write pulse. The widths of the first and/or last pulses of the write pulse waveform are varied in accordance with the magnitude of the present mark of input NRZI data and the magnitude of the leading and/or trailing spaces, thereby minimizing jitter to enhance system reliability and performance.
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This application is a continuation of application Ser. No. 10/774,404, filed Feb. 10, 2004, now U.S. Pat. No. 7,209,423, which is a continuation of application Ser. No. 09/609,822, filed Jul. 3, 2000, now U.S. Pat. No. 7,158,461, which is a divisional of application Ser. No. 09/359,128, filed Jul. 23, 1999, now allowed as U.S. Pat. No. 6,631,110, and claims the benefit of Korean Application No. 98-29732, filed Jul. 23, 1998, in the Korean Industrial Patent Office, the disclosures of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to an adaptive writing method for a high-density optical recording apparatus and a circuit thereof, and more particularly, to an adaptive writing method for optimizing light power of a light source, e.g., a laser diode, to be suitable to characteristics of a recording apparatus, and a circuit thereof.
2. Description of the Related Art
With the multi-media era requiring high-capacity recording media, optical recording systems employing high-capacity recording media, such as a magnetic optical disc drive (MODD) or a digital versatile disc random access memory (DVD-RAM) drive, have been widely used.
As the recoding density increases, such optical recording systems require optimal and high-precision states. In general, with an increase in recording density, temporal fluctuation (to be referred to as jitter, hereinafter) in a data domain increases. Thus, in order to attain high-density recording, it is very important to minimize the jitter.
Conventionally, a write pulse is formed as specified in the DVD-RAM format book shown in
In other words, the waveform of the write pulse is comprised of a combination of read power (
The waveform of the write pulse is the same as that in accordance with the first generation 2.6 GB DVD-RAM standard. In other words, in accordance with the 2.6 GB DVD-RAM standard, the waveform of the write pulse is comprised of a first pulse, a multi-pulse train and a last pulse. Although the rising edge of the first pulse or the falling edge of the last pulse can be read from a lead-in area to be used, adaptive writing is not possible since the write pulse is fixed to be constant.
Therefore, when a write operation is performed by forming such a write pulse as shown in
To solve the above problems, it is an objective of the present invention to provide an adaptive writing method of a write pulse generated in accordance with the magnitude of the present mark of input data and the magnitudes of the leading and/or trailing spaces thereof.
It is another objective of the present invention to provide an adaptive writing circuit for a high-density optical recording apparatus for optimizing light power of a laser diode by generating an adaptive write pulse in accordance with the magnitude of the present mark of input data and the magnitudes of the leading and trailing spaces thereof.
Accordingly, to achieve the first objective, there is provided a method for writing input data on an optical recording medium by a write pulse whose waveform is comprised of a first pulse, a last pulse and a multi-pulse train, the adaptive writing method including the steps of controlling the waveform of the write pulse in accordance with the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces to generate an adaptive write pulse, and writing the input data by the adaptive write pulse on the optical recording medium.
To achieve the second objective, there is provided an apparatus for writing input data on an optical recording medium by a write pulse whose waveform is comprised of a first pulse, a last pulse and a multi-pulse train, the adaptive writing circuit including a discriminator for discriminating the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces, a generator for controlling the waveform of the write pulse in accordance with the magnitude of the present mark of the input data and the magnitudes of the leading and/or trailing spaces to generate an adaptive write pulse, and a driver for driving the light source by converting the adaptive write pulse into a current signal in accordance with driving power levels for the respective channels.
The above objectives and advantages of the present invention will become more apparent by describing in detail a preferred embodiment thereof with reference to the attached drawings in which:
Hereinafter, a preferred embodiment of an adaptive writing method for a high-density optical recording apparatus and a circuit thereof will be described with reference to the accompanying drawings.
An adaptive writing circuit according to the present invention, as shown in
Next, the operation of the apparatus shown in
In
Here, the magnitudes of the leading and trailing spaces and the magnitude of the present mark may range from 3T to 14T. There can be more than 1,000 possible combinations. Thus, circuits or memories for obtaining the amounts of shift in rising edges of the first pulses and falling edges of the last pulses are necessary with respect to all cases, which complicates the system and hardware. Therefore, in the present invention, the magnitudes of the present mark and the leading and trailing spaces of input NRZI data are grouped into a short pulse group, a middle pulse group and a long pulse group and the grouped magnitudes of the present mark and the leading and trailing spaces are used.
The write waveform controller 104 shifts the rising edge of the first pulse back and forth in accordance with the magnitudes of the leading space and the present mark, supplied from the data discriminator 102, or shifts the falling edge of the last pulse back and forth in accordance with the magnitudes of the present mark and the trailing space, to thus form a write waveform having an optimal light power. Here, the multi-pulse train of a mark takes the same shape as shown in
Also, the write waveform controller 104 can correct the rising edge of the first pulse of the present mark and the falling edge of the last pulse of the present mark into different values in accordance with externally applied land/groove signals (LAND/GROOVE) indicating whether the input NRZI data is in a land track or a groove track. This is for forming a write waveform in consideration of different optimal light powers depending on the land and groove. A difference of 1-2 mW in the optimal light powers between the land and the groove, and may be specifically set or managed by the specifications.
Therefore, the write waveform controller 104 may be constituted by a memory in which data corresponding to a shift value of the rising edge of the first pulse and a shift value of the falling edge of the last pulse in accordance with the magnitude of the present mark of input NRZI data and the magnitudes of the leading and trailing spaces thereof, is stored, or a logic circuit. In the case that the write waveform controller 104 is constituted by a memory, the widths of the first pulse and the last pulse are determined as channel clocks (T) plus and minus a data value (shift value) stored in the memory. Also, in this memory, shift values of the first and last pulses of the mark for each of a land and a groove may be stored. A table in which the shift value of the rising edge of the first pulse is stored and a table in which the shift value of the falling edge of the last pulse is stored may be incorporated. Alternatively, as shown in
A microcomputer 106 initializes the write waveform controller 104 or controls the shift values of the first and/or last pulse(s) to be updated in accordance with recording conditions. In particular, in accordance with zones, the light power can vary or the shift values of the first and last pulses can be reset.
The pulse width data for controlling the waveform of the write pulse is provided to the write pulse generator 108. The write pulse generator 108 generates an adaptive write pulse, as shown in
The current driver 110 converts the driving level of the light power of the respective channels (i.e., read, peak and bias channels) into current for a control time corresponding to the control signal for controlling the current flow of the respective channels to allow the current to flow through the laser diode so that an appropriate amount of heat is applied to the recording medium by continuous ON-OFF operations of the laser diode or a change in the amounts of light. Here, a record domain as shown in
Alternatively, the falling edge of the last pulse may be shifted back and forth in accordance with the magnitude of the present mark, regardless of the magnitude of the trailing space of the present mark. Also, rather than shifting the rising edge of the first pulse and the falling edge of the last pulse, the edge of any one pulse may be shifted. Also, in view of the direction of shift, shifting may be performed back and forth, only forward or only backward.
Shift values of the rising edge of the first pulse are read from the table shown in
The adaptive write pulse in which the first pulse and the last pulse are controlled in accordance with the read shift value is generated (step S107). Then, the light powers of the respective channels for the generated adaptive write pulse, i.e., read, peak and bias powers, are controlled to drive a laser diode (step S108) to then perform a write operation on a disc (step S109). If the write mode is not an adaptive write mode, a general write pulse is generated in step S107.
In other words, according to the present invention, in adaptively varying the marks of a write pulse, the rising edge of the first pulse is adaptively shifted in accordance with the magnitude of the leading space and the magnitude of the present mark of input NRZI data to thus control the waveform of the write pulse, and/or the falling edge of the last pulse is adaptively shifted in accordance with the magnitude of the present mark and the magnitude of the trailing space of input NRZI data to thus control the waveform of the write pulse, thereby minimizing jitter. Also, the waveform of the write pulse may be optimized in accordance with land/groove signals. Also, in the present invention, grouping may be performed differently for the respective zones, using grouping pointers.
A new adaptive writing method according to the present invention can be adopted to most high-density optical recording apparatuses using an adaptive writing pulse.
As described above, the widths of the first and/or last pulses of a write pulse waveform are varied in accordance with the magnitude of the present mark of input NRZI data and the magnitude of the leading or trailing space, thereby minimizing jitter to enhance system reliability and performance. Also, the width of a write pulse is controlled by grouping the magnitude of the present mark and the magnitude of the leading or trailing spaces, thereby reducing the size of a hardware.
Claims
1. An optical recording medium having input data written using a write pulse waveform including a first pulse, a last pulse and a multi-pulse train, the optical recording medium comprising:
- data written on the optical recording medium using an adaptive write pulse waveform generated by varying a position of a rising edge of the first pulse of a mark to be written according to a length of the mark to be written and/or a leading space without regard for a trailing space of a present mark being written using the adaptive write pulse waveform, and a width of the first pulse is varied by varying the position of the rising edge,
- wherein the adaptive write pulse waveform is based on a grouping table, the grouping table storing rising edge data of the first pulse of the write pulse waveform varying according to corresponding stored values of lengths of marks to be written on the optical recording medium.
2. The optical recording medium of claim 1, wherein the grouping table stores the rising edge data of the first pulse for the write pulse waveform by grouping a length of the present mark and a length of the leading space of the present mark into corresponding pulse groups according to corresponding lengths of the present mark and the leading space.
3. The optical recording medium of claim 2, wherein the grouping table pulse groups comprise a short pulse group and another pulse group.
4. The optical recording medium of claim 3, wherein the pulse groups comprise a short pulse group and another pulse group, each member of the another pulse group having lengths greater than each member of the short pulse group.
5. An optical recording medium including data, written using a write pulse waveform including a first pulse, a last pulse and a multi-pulse train, the optical recording medium comprising:
- input data written on the optical recording medium using an adaptive write pulse waveform, wherein the adaptive write pulse waveform is generated by varying a position of a rising edge of the first pulse of a mark to be written according to a length of the mark to be written and/or a leading space, thereby controlling a write pulse waveform based on a grouping table storing rising edge data grouped in pulse groups which group the first pulse of the write pulse waveform by corresponding lengths of a present mark of input data and a leading space of the present mark,
- wherein a width of the first pulse is varied by varying the position of the rising edge.
6. The optical recording medium of claim 5, wherein the generated adaptive write pulse waveform is generated according to the lengths of the present mark and the leading space regardless of a length of a trailing space of the present mark.
4423502 | December 27, 1983 | Dil |
5327411 | July 5, 1994 | Iwasa et al. |
5418770 | May 23, 1995 | Ide et al. |
5490126 | February 6, 1996 | Furumiya et al. |
5499227 | March 12, 1996 | Higasa |
5568461 | October 22, 1996 | Nishiuchi et al. |
5569517 | October 29, 1996 | Tominaga et al. |
5633844 | May 27, 1997 | Maeda et al. |
5636194 | June 3, 1997 | Furumiya et al. |
5642343 | June 24, 1997 | Toda et al. |
5696752 | December 9, 1997 | Hajjar et al. |
5734637 | March 31, 1998 | Ootaki et al. |
5745467 | April 28, 1998 | Sakaue et al. |
5757735 | May 26, 1998 | Fitzpatrick et al. |
5850378 | December 15, 1998 | Ninamino et al. |
6018508 | January 25, 2000 | Hasegawa |
6044055 | March 28, 2000 | Hara |
6115339 | September 5, 2000 | Winarski |
6151281 | November 21, 2000 | Van Der Enden et al. |
6345026 | February 5, 2002 | Furukawa et al. |
6631110 | October 7, 2003 | Seo et al. |
7209423 | April 24, 2007 | Seo et al. |
0388897 | September 1990 | EP |
0851413 | December 1997 | EP |
0851413 | July 1998 | EP |
3-22223 | January 1991 | JP |
5-135363 | June 1993 | JP |
6-12674 | January 1994 | JP |
6-295440 | October 1994 | JP |
6-325364 | November 1994 | JP |
7-37250 | February 1995 | JP |
7-121878 | May 1995 | JP |
7-129959 | May 1995 | JP |
7-225947 | August 1995 | JP |
8-7282 | January 1996 | JP |
8-180413 | July 1996 | JP |
8-287465 | November 1996 | JP |
9-81937 | March 1997 | JP |
10-241164 | September 1998 | JP |
93-524 | January 1993 | KR |
WO 98/28735 | July 1998 | WO |
- Office Action issued in Chinese Patent Application No. 99111676.3 on Jun. 20, 2003.
- Office Action issued in Japanese Patent Application No. 2002-2741 on Apr. 20, 2004.
- Office Action issued in Japanese Patent Application No. 2002-2742 on Apr. 20, 2004.
- Office Action issued in Japanese Patent Application No. 2002-2749 on Apr. 20, 2004.
- Office Action issued in Japanese Patent Application No. 2000-319957.
- U.S. Appl. No. 09/609,822, filed Jul. 3, 2000, Jin-gyo Seo et al., Samsung Electronics Co., Ltd.
- U.S. Appl. No. 10/774,404, filed Feb. 10, 2004, Jin-gyo Seo et al., Samsung Electronics Co., Ltd.
- U.S. Appl. No. 11/432,473, filed May 12, 2006, Jin-gyo Seo et al., Samsung Electronics Co., Ltd.
- U.S. Appl. No. 11/685,538, filed Mar. 13, 2007, Jin-gyo Seo et al., Samsung Electronics Co., Ltd.
Type: Grant
Filed: May 12, 2006
Date of Patent: Jun 24, 2008
Patent Publication Number: 20060203697
Assignee: Samsung Electronics Co., Ltd. (Suwon-si)
Inventors: Jin-gyo Seo (Seoul), Seong-sin Joo (Suwon), Du-seop Yoon (Suwon), Myung-do Roh (Suwon), Yong-jin Ahn (Seoul), Seoung-soo Kim (Seoul), Kyung-geun Lee (Sungnam), Myeong-ho Cho (Seoul), Chang-jin Yang (Suwon), Jong-kyu Kim (Suwon), Sung-ro Ko (Gunpo), Tatsuhiro Ohtsuka (Suwon)
Primary Examiner: Andrea Wellington
Assistant Examiner: Michael V Battaglia
Attorney: Stein, McEwen & Bui, LLP
Application Number: 11/432,472
International Classification: G11B 7/0045 (20060101);